saibot Posted September 27, 2009 Share Posted September 27, 2009 I've been shooting Precision Bullets 9mm 125g bullets for a while and bought BBI 130g when I wasn't able to get the PBs. I was using 3.9g of AA Solo1000 and now I need to know what you all think about adjustments with the new heavier bullet. Would I need to reduce the powder to maintain PF? If so, how much? Thanks! Link to comment Share on other sites More sharing options...
JimmyZip Posted September 27, 2009 Share Posted September 27, 2009 I've been shooting Precision Bullets 9mm 125g bullets for a while and bought BBI 130g when I wasn't able to get the PBs. I was using 3.9g of AA Solo1000 and now I need to know what you all think about adjustments with the new heavier bullet. Would I need to reduce the powder to maintain PF? If so, how much?Thanks! You shouldn't need to lower your charge if your last bullet was lead like the BBIs are. I like them for 9mm. Check the search on the 9mm section as I had a thread on these and there were some recipe suggestions. I can't find my load data right now, but IIRC 3.9 sounds allright. I think maybe even 3.8. JZ Link to comment Share on other sites More sharing options...
boz1911 Posted September 27, 2009 Share Posted September 27, 2009 Yes you will need to reduce the powder charge any time you use a heavier bullet. How much I don't know and until you check the results over a chrono, you won't either. Keep good records irregardless. Link to comment Share on other sites More sharing options...
saibot Posted September 27, 2009 Author Share Posted September 27, 2009 Thanks you guys for the responses! I know ultimately I'll need to chrono them (but I don't have access to one) and was hoping for some cool rule of thumb or mathematical trick I didn't know about to figure it out. Oh well. I will set to 3.8 and crank out a test batch and beer-bribe someone with a chrono. Thanks again everyone! Link to comment Share on other sites More sharing options...
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